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rule osx_pirrit_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/osx.pirrit" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 5b 5d ff25???????? 8b4338 } // n = 4, score = 100 // 5b | pop ebx // 5d | pop ebp // ff25???????? | // 8b4338 | mov eax, dword ptr [ebx + 0x38] $sequence_1 = { 48 8d0d894b0000 48 8b35???????? } // n = 4, score = 100 // 48 | dec eax // 8d0d894b0000 | lea ecx, [0x4b89] // 48 | dec eax // 8b35???????? | $sequence_2 = { c705????????00000000 48 8d05d6270000 48 8905???????? 48 } // n = 6, score = 100 // c705????????00000000 | // 48 | dec eax // 8d05d6270000 | lea eax, [0x27d6] // 48 | dec eax // 8905???????? | // 48 | dec eax $sequence_3 = { 89c6 48 8b3d???????? 48 8b35???????? 4c 8b3d???????? } // n = 7, score = 100 // 89c6 | mov esi, eax // 48 | dec eax // 8b3d???????? | // 48 | dec eax // 8b35???????? | // 4c | dec esp // 8b3d???????? | $sequence_4 = { 48 8945d8 b000 e8???????? } // n = 4, score = 100 // 48 | dec eax // 8945d8 | mov dword ptr [ebp - 0x28], eax // b000 | mov al, 0 // e8???????? | $sequence_5 = { 48 8b7f08 48 8b15???????? } // n = 4, score = 100 // 48 | dec eax // 8b7f08 | mov edi, dword ptr [edi + 8] // 48 | dec eax // 8b15???????? | $sequence_6 = { 48 8d05bd130000 48 8d0d020e0000 } // n = 4, score = 100 // 48 | dec eax // 8d05bd130000 | lea eax, [0x13bd] // 48 | dec eax // 8d0d020e0000 | lea ecx, [0xe02] $sequence_7 = { 48 8b7dd8 45 84f6 7414 48 8d352f2e0000 } // n = 7, score = 100 // 48 | dec eax // 8b7dd8 | mov edi, dword ptr [ebp - 0x28] // 45 | inc ebp // 84f6 | test dh, dh // 7414 | je 0x16 // 48 | dec eax // 8d352f2e0000 | lea esi, [0x2e2f] $sequence_8 = { 8d059f2c0000 48 8d0db52c0000 48 } // n = 4, score = 100 // 8d059f2c0000 | lea eax, [0x2c9f] // 48 | dec eax // 8d0db52c0000 | lea ecx, [0x2cb5] // 48 | dec eax $sequence_9 = { 0f85e5010000 48 8d3da70b0000 e8???????? 48 } // n = 5, score = 100 // 0f85e5010000 | jne 0x1eb // 48 | dec eax // 8d3da70b0000 | lea edi, [0xba7] // e8???????? | // 48 | dec eax $sequence_10 = { 56 53 50 49 89fe be01000000 e8???????? } // n = 7, score = 100 // 56 | push esi // 53 | push ebx // 50 | push eax // 49 | dec ecx // 89fe | mov esi, edi // be01000000 | mov esi, 1 // e8???????? | $sequence_11 = { 8d35972e0000 ba02000000 48 89df e8???????? 85c0 } // n = 6, score = 100 // 8d35972e0000 | lea esi, [0x2e97] // ba02000000 | mov edx, 2 // 48 | dec eax // 89df | mov edi, ebx // e8???????? | // 85c0 | test eax, eax $sequence_12 = { 89cf 88853ffeffff e8???????? 8a853ffeffff a801 0f8505000000 e9???????? } // n = 7, score = 100 // 89cf | mov edi, ecx // 88853ffeffff | mov byte ptr [ebp - 0x1c1], al // e8???????? | // 8a853ffeffff | mov al, byte ptr [ebp - 0x1c1] // a801 | test al, 1 // 0f8505000000 | jne 0xb // e9???????? | $sequence_13 = { 48 c705????????00000000 48 8d0546290000 48 8905???????? 48 } // n = 7, score = 100 // 48 | dec eax // c705????????00000000 | // 48 | dec eax // 8d0546290000 | lea eax, [0x2946] // 48 | dec eax // 8905???????? | // 48 | dec eax $sequence_14 = { 48 0f45c8 48 890c24 48 8d35492c0000 } // n = 6, score = 100 // 48 | dec eax // 0f45c8 | cmovne ecx, eax // 48 | dec eax // 890c24 | mov dword ptr [esp], ecx // 48 | dec eax // 8d35492c0000 | lea esi, [0x2c49] $sequence_15 = { 747f eb1a 48 8d05662e0000 48 8945d0 } // n = 6, score = 100 // 747f | je 0x81 // eb1a | jmp 0x1c // 48 | dec eax // 8d05662e0000 | lea eax, [0x2e66] // 48 | dec eax // 8945d0 | mov dword ptr [ebp - 0x30], eax condition: 7 of them and filesize < 169600 }
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